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首页> 外文期刊>Journal of Paleontology >NEW OCCURRENCES OF THE PENNSYLVANIAN INDEX AMMONOID DUNBARITES FROM THE NORTH AMERICAN MIDCONTINENT
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NEW OCCURRENCES OF THE PENNSYLVANIAN INDEX AMMONOID DUNBARITES FROM THE NORTH AMERICAN MIDCONTINENT

机译:北美中部宾夕法尼亚州索引性羊膜饰物的新出现

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摘要

Ten newly recovered Dunbarites specimens significantly extend the known stratigraphic range of Dunbarites. These include the first documented Midcontinent Basin records of the Missourian type species Dunbarites rectilateralis (Miller, 1930) from north-central Oklahoma. Additional species of Dunbarites from south-central Oklahoma and north-central and West Texas are described as Dunbarites wewokensis n. sp. and Dunbarites boardmani n. sp. Although Dun-barites is an extremely rare component (__0.025 percent) of Middle and Upper Pennsylvanian ammonoid assemblages, Ruzhencev and Bogoslovskaya (1971, 1978) suggested that Dunbarites and Parashumardites Ruzhencev, 1939 be used as genozone markers for the Kasimovian [Zhigulevian] Stage (Missourian in North America). As demonstrated by this report, the range of Dunbarites is not confined to the Kasimovian, thereby precluding its use as a Kasimovian Stage indicator.
机译:十个新发现的邓巴人标本大大扩展了已知的邓巴人地层范围。其中包括俄克拉荷马州中北部密苏里州类型的物种Dunbarites rectilateralis(米勒,1930年)的第一个记录的中大陆盆地记录。来自俄克拉荷马州中南部,中北部和西德克萨斯州的邓巴人的其他物种被称为邓巴人wewokensis n。 sp。和Dunbarites boardmani n。 sp。尽管Dun-重晶石是宾夕法尼亚州中上层铵盐类组合中极为罕见的组分(占0.025%),但Ruzhencev和Bogoslovskaya(1971年,1978年)建议将Dunbarites和Parashumardites Ruzhencev,1939年用作卡西摩维亚语(Zhigulevian)的基因区标记舞台(北美密苏里州)。如本报告所示,邓巴人的范围并不局限于卡西莫维人,因此排除了其作为卡西莫维人阶段指标的用途。

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